.background{
    width: 800px;
    height: 600px;
    background-color:darkgray;
}

.header{
    height: 10%;
}
.login{
    background-color: aqua;
    display: inline-block;
    width: 50%;
    height: 80%;
}

.login_right{
    background-color: chartreuse;
    display: inline-block;
    width: 50%;
    height: 80%;
}